function btnOver(leftSrc, centerSrc, rightSrc, targetLeft, targetCenter, targetRight ) {
	document.getElementById(leftSrc).src=targetLeft;
	document.getElementById(rightSrc).src=targetRight;
	document.getElementById(centerSrc).style.background="#FFFFFF url("+targetCenter+")";
}

function btnOver2(leftSrc, centerSrc, rightSrc, offset) {
    document.getElementById(leftSrc).style.backgroundPosition = "0px " + offset;
    document.getElementById(rightSrc).style.backgroundPosition = "0px " + offset;
    document.getElementById(centerSrc).style.backgroundPosition = "0px " + offset;
}